Creating an Image from an ISO File

Scenarios

An ISO file is a disk image of an optical disc. A large number of data files can be compressed into a single ISO file. Likewise, to access the files stored in an ISO, the ISO file needs to be decompressed. For example, you can use a virtual CD-ROM to open an ISO file, or burn the ISO file to a CD or DVD and then use the CD-ROM to read the image.

This section describes how to use APIs to create a private image from an ISO file.

Involved APIs

If you use a token for authentication, you must obtain the token and add X-Auth-Token to the request header of the IMS API when making an API call.

IAM API used to obtain the token
URI format: POST https://IAM endpoint/v3/auth/tokens
IMS API used to create a private image using an image file uploaded to the OBS bucket
URI format: POST https://IMS endpoint/v2/cloudimages/action
ECS API used to create an ECS
URI format: POST https://ECS endpoint/v1/project_id/cloudservers
IMS API used to create a system disk image from a data disk
URI format: POST https://IMS endpoint/v2/cloudimages/action

Procedure

Obtain the token by referring to Authentication.

Create a private image using an ISO image file uploaded to the OBS bucket.

Send POST https://IMS endpoint/v2/cloudimages/action.
Add X-Auth-Token to the request header.

Set the following parameters in the request body:

For details about the parameters, see Creating an Image.

{
    "name": "ims_test_file",  //Image name (mandatory, string)
    "description": "Image creation using an image file uploaded to the OBS bucket",  //Image description (optional, string)
    "image_url": "ims-image:centos70.iso",  //Image file address in an OBS bucket (mandatory, string)
    "os_type": "Linux", //OS type (optional, string)
    "os_version": "CentOS 7.0 64bit",  //OS version (mandatory, string)
    "type": "IsoImage", //Image type (mandatory, string)
    "min_disk": 40,  //Minimum system disk space (mandatory, integer)
    "image_tags": [{"key":"key2","value":"value2"},{"key":"key1","value":"value1"}]  //Image tags (optional, array of objects)
}

Obtain the image ID by querying job details based on the returned job_id. For details, see Querying the Status of an Asynchronous Job.

Create a temporary ECS from the ISO image.
- You can select only a general-computing flavor with 2 vCPUs, 4 GB or more memory, and KVM virtualization type.
- You need to create a system disk and a data disk for the ECS. The OS will be installed on the data disk by default.
1. Send POST https://ECS endpoint/v1/project_id/cloudservers.
2. Add X-Auth-Token to the request header.
3. Set the following parameters in the request body:
  The following parameters are all mandatory. For details about the parameters, see "Creating an ECS" in Elastic Cloud Server API Reference.
```
{
    "server": {
        "imageRef": "fac42d61-ea1e-4271-94ba-6543a852d2c6", //Image ID
        "flavorRef": "rc6.large.2_manage",
        "name": "instance-test",
        "vpcid": "18ec99f0-7159-4d7b-ad27-f32315d5af61",
        "nics": [{
            "subnet_id": "81a4ecb0-0451-4c60-8373-8b923238ec40"
        }],
        "root_volume": {
            "volumetype": "SATA",
            "size": "40"
        },
        "data_volumes": [{
            "volumetype": "SATA",
            "size": "40"
        }],
        "availability_zone": "az-1a",
        "metadata": {
            "virtual_env_type": "IsoImage"
        },
        "extendparam": {
            "diskPrior": "true"
        }
    }
}
```
4. Obtain the ECS ID by querying job details based on the returned job_id. For details, see "Querying Task Execution Status" in Elastic Cloud Server API Reference.
5. Query ECS details based on the ECS ID to obtain the data disk ID (volume_id) required in 4. For details, see "Querying Details About an ECS" in Elastic Cloud Server API Reference.

Use the temporary ECS to create a standard private image.

Send POST https://IMS endpoint/v2/cloudimages/action.
Add X-Auth-Token to the request header.

Set the following parameters in the request body:

For details about the parameters, see Creating an Image.

{
    "name": "ims_test",  //Image name (a mandatory string)
    "description": "Creating a system disk image from a data disk", //Image description (optional, string)
    "volume_id": "877a2cda-ba63-4e1e-b95f-e67e48b6129a", //Data disk ID (mandatory, string)
    "type": "ECS", //Image type (mandatory, string)
    "os_version": "CentOS 7.0 64bit",  //OS version (mandatory, string)
    "image_tags": [{"key":"key2","value":"value2"},{"key":"key1","value":"value1"}]  //Image tags (optional, array of objects)
}